A kind of production method of fine-grained high-strength PMN-PZT piezoelectric ceramic material

Abstract

The invention discloses a production method of a fine-grain high-strength PMN-PZT (lead zirconate titanate) piezoelectric ceramic material. The production method comprises the following steps of: weighing raw materials including PbO, MgO, Nb2O5, TiO2, ZrO2, Bi2O3 and MnO2 in a stoichiometric ratio of (x)Pb(Mg1 / 3Nb2 / 3)O3-(1-x)Pb(TiyZr(1-y))O3-(a)Bi2O3-(b)MnO2-(c)Nb2O5-(d)ZnO-(e)SnO2, wherein x is 0.35-0.40, y is 0.40-0.70, and a, b, c, d, e are 0-1%; carrying out the process steps of ball milling, calcining, secondary ball milling, pelleting, tabletting, adhesion eliminating, sintering and the like to obtain a product. Therefore, by adopting the production method, the synthesis temperature of PMN-PZ-PT in the prior art can be greatly reduced, the compactness of a ceramic sample is high, the grain is tiny (-2 microns), the grain size is uniform, and a fracture mode realizes conversion from an intergranular fracture mode to a trans-granular fracture mode, namely the grain-boundary strength is greatly improved.

Description

technical field [0001] The invention relates to the field of low-temperature sintered fine-grain piezoelectric materials, in particular to a production method of a fine-grain high-strength PMN-PZT piezoelectric ceramic material. Background technique [0002] Usually, the sintering temperature of PMN-PZT ceramic material is 1200-1260°C. Such a high temperature not only increases the volatilization of Pb, but also seriously grows the grains. High temperature sintering and large grains are especially not conducive to the preparation of multilayers with Ag electrodes and low firing. Piezoelectric Ceramics. On the other hand, the brittleness of ceramics is another bottleneck limiting its use, which mainly comes from the low strength of ceramic grain boundaries. [0003] PMN-PZT has high piezoelectric properties and large electrostrictive properties, but when prepared by the traditional solid-state method, the sintering temperature is as high as 1200 ° C, such a high sintering te...

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Problems solved by technology

[0002] Usually, the sintering temperature of PMN-PZT ceramic material is 1200-1260°C. Such a high temperature not only increases the volatilization of Pb, but also seriously grows the grains. High temperature sintering and large grains are especially not conducive to the preparation of multilayers with Ag electrodes and low firing. Piezoelectric Ceramics

On the other hand, the brittleness of ceramics is another major bottleneck limiting its use, which mainly comes from the low strength of ceramic grain boundaries

[0003] PMN-PZT has high piezoelectric properties and large electrostrictive properties, but when prepared by the traditional solid-state method, the sintering temperature is as high as 1200 ° C, such a high sintering temperature not only makes the stoichiometric ratio unbalanced, but also leads to crystal High sintering temperature and large grains are not conducive to the preparation of MLCC, and too large grains will seriously reduce the strength of ceramic materials and reduce the life of ceramic devices

Although special preparation techniques (such as high-energy ball milling) can reduce the grain size of ceramic materials, the complex process and high cost are not conducive to industrial production.

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